fastest-disappearing animal in madagascar, the plowshare tortoise, whose shrinking habitat is so deep in the wilderness, it's only accessible by boat. >> goode: this tortoise is one of the world's most endangered animals. it is the world's most endangered tortoise. and it has an incredibly high price on its head. asian countries love gold and this is a gold tortoise. and so literally, these are like gold bricks that one can pick up and sell. >> stahl: we were following the path the poachers take, landing on a deserted beach, and off we went on a long hike. we walked through scrub brush in blazing heat for almost an hour. >> goode: if the sun gets too high up, they just disappear. >> stahl: the once plentiful plowshare population here, he says, could be down to as few as 300 adults. >> goode: and this is where the guards are based. >> stahl: goode has helped hire around 40 locals to go out and find the tortoises before the poachers do. >> angelo: we have to be on a team of many people. >> goode: different lines, 30 feet apart. >> angelo: yeah. >> goode: all right, let's go. >> stahl: we lined up the way